Perhaps you should try some spelling variations:
"operations theory, advances and applications" » "operators theory, advances and applications", "observations theory, advances and applications", "relations theory, advances and applications"
"operation theory, advances and applications" » "generation theory, advances and applications", "aberration theory, advances and applications", "operation theatre, advances and applications"
"iteration theory, advances and applications" » "integration theory, advances and applications", "interaction theory, advances and applications", "vibration theory, advances and applications"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("operation theory, advances and applications") OR ("operator theory, advances and applications"))) OR ("iteration theory, advances and applications"))) OR ("operations theory, advances and applications")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"operation theory, advances and applications\") OR (\"operator theory, advances and applications\"))) or (\"iteration theory, advances and applications\"))) or (\"operations theory, advances and applications\"))".
• Removing quotes may allow a broader search: (((((( operation theory, advances and applications ) OR ( operator theory, advances and applications ))) or ( iteration theory, advances and applications ))) or ( operations theory, advances and applications )).
• Adding a wildcard symbol may retrieve word variants: (((((("operation theory, advances and applications") OR ("operator theory, advances and applications"))) or ("iteration theory, advances and applications"))) or ("operations theory, advances and applications"))*.